Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 109 · 40 questions

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

1. 1.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
4. 4.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points right (b) points straight up (c) points up and left (d) points up and right
5. 5.🦾 A servo moves from 160° to 50°. How many degrees does it turn?
6. 6.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
7. 7.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points left (b) points up and left (c) points straight up (d) points right
8. 8.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
9. 9.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
11. 11.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 60° to 10°. How many degrees does it turn?
15. 15.🦾 A servo moves from 60° to 170°. How many degrees does it turn?
16. 16.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
17. 17.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
18. 18.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
19. 19.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
21. 21.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
22. 22.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
23. 23.🦾 A servo moves from 150° to 90°. How many degrees does it turn?
24. 24.🦾 A servo moves from 140° to 90°. How many degrees does it turn?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
27. 27.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo moves from 140° to 110°. How many degrees does it turn?
29. 29.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
30. 30.🦾 A servo moves from 120° to 170°. How many degrees does it turn?
31. 31.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
32. 32.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
33. 33.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
34. 34.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points straight up (b) points right (c) points up and right (d) points left
35. 35.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points right (c) points straight up (d) points up and left
37. 37.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points right (b) points up and left (c) points up and right (d) points left
38. 38.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo moves from 180° to 60°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?

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